Power measuring apparatus
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United States of America Patent
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Sep 7, 1982
Issued Date -
N/A
app pub date -
Apr 24, 1980
filing date -
Jul 17, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for measuring power consumed by a load connected via mains to a source of alternating current having a given fundamental frequency includes means for generating a first signal proportional to the instantaneous voltage across the load and a transformer secondary toroidally wrapped around one of the mains for generating a second signal proportional to the instantaneous current through the load. Tuned amplifiers of narrow band pass amplify the signals before they are fed to a square low multiplier means including photooptical devices.
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